I do not know much about computers but usually enough to fix my own minor problems. I have not been able to fix this.

I installed my old GeForce2 MX 400 PCI into my parents' computer rather than the standard card that comes with the computer. Whenever I plug the monitor into it, all I get is a black screen with a "Input Not Supported" message.

The monitor they have is terrible so I'm guessing that that could have something to do with it, but I figured almost anything could handle an old GeForce 2 (64MB i believe).

The first thing I needed to do was go into my BIOS and change the priority from AVG to PCI.
Then when i restarted computer with monitor plugged into the PCI card I was able to see it boot up and also the "Starting Windows XP" screen. However, once windows actually loaded it went to a grayish-black screen. When I switch back to other card I can see that Windows has properly loaded.